Auto focus adjustment apparatus and image pickup apparatus
a technology of auto focus adjustment and image pickup, which is applied in the direction of counting objects on conveyors, instruments, optical elements, etc., can solve the problems of affecting the accuracy of the correction value of the defocus amount, the focusing position can be changed more accurately, and the viewer feels a part of an enlarged photographed image out of focus
Inactive Publication Date: 2015-02-10
CANON KK
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AI Technical Summary
Benefits of technology
Enables more accurate and flexible focus adjustments, reducing the need for costly recalibration and improving focusing accuracy, allowing for better image quality and user control over focus settings.
Problems solved by technology
On the other hand, it is known that there is a possibility of a shift of the focusing position if a strong impact is applied to the camera and the photographing lens owing to their falls and the like after their factory shipments.
Because the places where the service centers exist are limited, there is the problem of loss of swiftness.
As a result, there is a possibility that some viewers feel a part of an enlarged photographed image to be out of focus when looking at that part.
However, if the focusing accuracy thereof is excessively raised for an industrial product that is manufactured in a large quantity, such as a camera, this remarkably increases the manufacturing cost of the product and results in a very expensive product.
Method used
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embodiment
[0022]FIG. 1 is a block diagram showing the configuration of an interchangeable photographing lens type single lens reflex camera including an auto focus adjustment apparatus in accordance with the present embodiment.
[0023]The camera shown in FIG. 1 includes a lens micro processing unit (MPU) 1, a lens drive unit 2 for driving a lens 16, an iris drive unit 3 for driving an iris 17, and a distance ring position detection unit 14 for detecting the distance ring position of a photographing lens 100. The information of the distance ring position is the information corresponding to the position of a focus lens of the photographing lens 100, and if the photographing lens is in an in-focus state of an object, this information corresponding to an object distance. The camera further includes a zoom position detection unit 15 for detecting a zoom position of the photographing lens 100, and the zoom position detection unit 15 can communicates the present distance ring position and zoom positio...
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An auto focus adjustment apparatus includes: a correction unit which corrects a defocus amount detected by a defocus amount detection unit, correspondingly to a focus area selected from a plurality of focus areas; a storage unit which stores a correction value to be used by the correction unit at a time of correcting the defocus amount; and a correction value changing unit configured to change the correction value, wherein the correction value changing unit is arranged to be capable of changing the correction value for a plurality of selected focus areas and at a plurality of zoom positions.
Description
BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an auto focus adjustment apparatus including a defocus amount detection unit configured to detect defocus amounts, and relates to an image pickup apparatus equipped with the auto focus adjustment apparatus.[0003]2. Description of the Related Art[0004]In the auto focus adjustment apparatus of a general inter-changeable photographing lens type single reflex camera system, a camera and an interchangeable photographing lens (hereinafter referred to as photographing lens) each incorporate a micro processing unit (MPU) individually to communicate mutually, and thereby the camera and the photographing lens function as a whole. To put it concretely, the camera MPU controls a sensor for detecting a defocus amount for focus detection, and the lens MPU transmits an optical focusing correction value of each photographing lens to the camera MPU to perform the optimum focus detection of each photograp...
Claims
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IPC IPC(8): G02B7/04G06M7/00G02B7/28
CPCG02B7/28
InventorYOSHIDA, TOMOKAZU
OwnerCANON KK